Re: [virtio-comment] [PATCH requirements 6/7] net-features: Add packet timestamp requirements

[David Edmondson <david.edmondson@oracle.com>]

On Monday, 2023-07-24 at 06:34:20 +03, Parav Pandit wrote:
> Add tx and rx packet timestamp requirements.
>
> Signed-off-by: Parav Pandit <parav@nvidia.com>

Acked-by: David Edmondson <david.edmondson@oracle.com>

> ---
>  net-workstream/features-1.4.md | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/net-workstream/features-1.4.md b/net-workstream/features-1.4.md
> index d228462..37820b6 100644
> --- a/net-workstream/features-1.4.md
> +++ b/net-workstream/features-1.4.md
> @@ -10,6 +10,7 @@ together is desired while updating the virtio net interface.
>  2. Low latency tx and rx virtqueues for PCI transport
>  3. Virtqueue notification coalescing re-arming support
>  4  Virtqueue receive flow filters (RFF)
> +5. Device timestamp for tx and rx packets
>  
>  # 3. Requirements
>  ## 3.1 Device counters
> @@ -280,3 +281,28 @@ struct virtio_net_rff_delete {
>  	u8 padding[2];
>  	le32 flow_id;
>  };
> +
> +## 3.5 Packet timestamp
> +1. Device should provide transmit timestamp and receive timestamp of the packets
> +   at per packet level when the device is enabled.
> +2. Device should provide the current free running clock in the least latency
> +   possible using an MMIO register read of 64-bit to have the least jitter.
> +3. Device should provide the current frequency and the frequency unit for the
> +   software to synchronize the reference point of software and the device using
> +   a control vq command.
> +
> +### 3.5.1 Transmit timestamp
> +1. Transmit completion must contain a packet transmission timestamp when the
> +   device is enabled for it.
> +2. The device should record the packet transmit timestamp in the completion at
> +   the farthest egress point towards the network.
> +3. The device must provide a transmit packet timestamp in a single DMA
> +   transaction along with the rest of the transmit completion fields.
> +
> +### 3.5.2 Receive timestamp
> +1. Receive completion must contain a packet reception timestamp when the device
> +   is enabled for it.
> +2. The device should record the received packet timestamp at the closet ingress
> +   point of reception from the network.
> +3. The device should provide a receive packet timestamp in a single DMA
> +   transaction along with the rest of the receive completion fields.
-- 
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